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When an object is at a distance u(1) and...

When an object is at a distance `u_(1)` and `u_(2)` from the optical centre of a lens, a real and virtual image are formed respectively, with the same magnification.The focal length of lens is:

A

`(u_(1)+u_(2))`

B

`u_(1)+(u_(2))/(2)`

C

`(u_(1)+u_(2))/(2)`

D

`(u_(1)-u_(2))/(2)`

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